Expansion bolt-anchor.



H. W. YLEISTER. EXPANSION BOLT ANUHOB.

PPLIGATION rum) umm, 190s.

Patented Mar. 1, 1910.

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@Dvi/Immun dJ-l0 Qu. 70"

HENRY W. PLEIBTEE, 0F WESTFIELD,

NEW JERSEY, ASBIGNOB T0 HENRY B.

NEWHALL, 0F PLAINFIELD, NEW JERSEY.

EXPANSION BOLT-ANCHOR.

Bpecication of Letters ratcnt.

Patented Mar. l, 1910.

Application med January 18, 1808. Serial No. 411,140.

To all whom 'it 'ma/y concern:

Be it known that of Westfield, in the county of Union and State of New Jersey, have invented certain new and usefullmprovements in Expansion Bolt-Anchors, (.Case 13,) of which the following is a specification, taken in connection f with the accompanying form a part of the same.

This invention relates to expansion bolt anchors and more artcularly to increasing the eicctive len th of comparatively short expansiblc mem ers of an anchor by forming the bolt anchor with an adjustable nonexpansible member to permit the expnnsible and non-expansible parts of the bolt anchor to be adusted with relation to each other, which will permit a comparatively long lag screw, bolt or other expanding means to be used with a comparatively short expansible member.

In the accompanying drawings showing an illustrative embodiment of this invention and in which the same reference numeral refers to similar arts in the several figures, Figure 1 is a ongitndinal vertical section showing my bolt anchor in operative position, the parts of the shield for purposes of illustration being shown at an exaggerated angle to cach other, and in side elevation as is the lag screw. Fig. 2 is n longitudinal vertical section similar to Fi 1 but showing the bolt anchor used with a mger lag screw und. in a dee er hole in the masonry, brick or other suita le support, the lag screw being shown in side elevation. Fi 3 is n perspective view of the separate seeve or thimblc of the bolt. anchor.

In the illustrative embodiment of this invention shown in the drawings l is a. support of masonry, brick, cement or any other material in which a hole 2 has been drilled` bored or otherwise made, for the. reception of the bolt anchor 3 and lag screw 4 used to secure a supported member 5 to the masonry or other support 1.

drawings, which The holt anchor muy he formed of a mrmber comprising a plurality of cxpansble sections, two sections (i and 7 being shown for purposes of illustration, and a non-expansible part, though it is to be understood that this number may multiplied without departing from my invention. Upon one nf the expansible sections, for instance (i, I

I Hanni' W. Pnms'rnn, a citizen of the United States, and a resldent i g form preferably on each of its meeting faces il, i), though this is not material, one or more protuberances or rejections, 8, 8 which register with comp ementary sockets 10 10, upon the eoperatin faces 1l, 1l, of the section 7. These projections and sockets are very eii'ectivc in preventing relative movement of the members 6 and 7 before the expansible members are placed in the hole 2, and also prevents relative movement of these two parts 6 and 7 when the lng screw or machine boltforces them apart. as shown for instance in Fig. 1.

The exterior surface of the shields 6 and may be formed with serrations or teeth 12, l 12., to increase the friction of the shields l when expanded in the hole 2; these serrations or teeth 12, 12, may however be omitted leaving the exterior surface smooth. The interior of the shields 6 and may be screwthreaded to cooperate with the threads of either a lag screw or n machine screw, for it is to be understood that either form of screw threads mav be used upon the expanding means. nstead of forming screw threads upon the interior of the members 6 and 7 they may be left plain, the threads being formed upon them by the male threads of either the screw threads of the lag screw or the machine screw upon the expanding means.

lVith the bolt anchors now in use it is found necessary to carry quite an assortment of different len 'hs of bolt anchors to lit different depths ot holes Q and diti'erent lengths of lav screws or machine bolts, whichever are used with the bolt anchor. If the length of the bolt anchor be for instance, too great to snu ly fit within the hole 2 the su ported member 5 would not be held snugly against the support 1 and would present un :nm'orkluanlike appearance and one which would not be tolerated in rar-tice. lfon the other hand the length o the bolt anchor is not sullcient to till the hole 2., und it is necessary to use a longer lug screw or machine holt with it than the length ordinarily used, the headed end of the bolt. or Ing screw is left unsupported with the weight 5 upon it.

and with n leverage. which in practice serves lo either breuk or bend the bolt or lul@f screw, l permitting the supmrled member n to become entirely demoted from the support l` i or, if the bolt merely bonds, to he. thrown out I of plumb.

Where the support l is brick work it is often found in practice necessary, to get a firm su port, to carry the depth 0f the hole 2 bac t into the second course of bricks, and place ractically all of the expanding force.` of t e bolt anchor upon that inner course of bricks rather than upon the front or face of the wall. In such cases it is necessary to use a comparatively short bolt anchor with a comparatively long lag screw or machine bolt. The etiect 1n such cases is that only that portion of the lag screw or machine bolt within the bolt anchor is supported, the other portion, upon which is mounted the supported member 5, bem liable to breuk or bend as previously pointe out.

The necessity of using shorter cxpansible members than the depth of the hole 1s also imperative where it is necessary to go through a soft or frangible body, such as plaster or enamel brick, or similar materials, to get to the backing of firmer substance. If the expanding strain of the ordinary bolt anchor was transmitted to such surfaces they would crumble or be chipped or otherwise marred and damaged. To prevent such damage and to permit in practice a Great range or usefulness for comparatively short expanding sections, with a comparatively long lag screw or machine bolt Without damage or injury to the screw or bolt, I use a bolt anchor having a member comprising expansible sections and a separate non-expansible member relatively movable to the member comprising the expansible sections. The nonexpansible member consists of a hollow cylindrical body portion 14 and preferably, though not necessarily, an annular tlange 15.

The interior bore 16 should be of just sulicient diameter to snugly fit the lag screw or machine bolt which passes through it; the diameter of the cylindrical body portion 14 is such as to ht the hole 2. Figs. l and 2. In use, after the ex ansible members 6 and 7 of the holtanc or have been placed in the hole 2 a suiicient depth to acronunodate the particular length of lag screw or machine olt to he used, l force the non-expansiblc member or thimble 13 of tln.` bolt anchor into the mouth of the holo 2 and t then pass the la screw 4 through it into the expansible mem 1ers 6 and i', Fig. 1. By the use of my bolt anchor having the nonfexpansihle member or thimble the bending; or

torslonal strain upon the end of the holt is transmitted to the masonry or other support, for the entire length of the holt, witlnn the l hole 2, is supported at all points, Fig. 1. ll In those cases where the holel 2 is of greater depth than the combined length of the expnnslble sections 6 und T und the thimhlc 13, I arrange my bolt. anchor so that the expunsible members arc placed at the proper depth in the hole to cooperate with the particular length of lag screw or bolt to be used and the non-expansible member or thimble 13 is preferably located at the mouth of the hole with its outer surface flush with the surface of the support 1, Fig. 2. The flange 15, where one is used, serves to limit the inward movement of the thimble 13 and also protects the` surface of the support at this point. The mouth of the hole 2 may be enlarged,in any suitable manner for the reception of the annular flange 15er the flange can be forced into the support 1, if formed of material which will permit it. To prevent the nonexpansihle member or thimble 13 from turning in the hole 2, I form one or more ribs 17, 17, on its outer surface and, when an annular flange is used, preferably connect these ribs to the flange, though this is not essential.

In the arrangement shown in Fig. 2 there is a space 18 between the expansible members and the non-expansible member or thimble. This of course in use may be increased or decreased. By the use of my inventon I am also enabled to make short expansiblc members do the work of larger ex pansible members with the accompanying saving in cost of manufacture and shipping.

Having thus described this invention in connection with an illustrative embodiment thereof, to the details of which I do not desire to be limited, what is claimed as new and what it is desired to secure by Letters Patent is set forth in the appended claims.

1. The combination with a bolt anchor 100 having a non-expansible member and a separate expansible member adjustable toward and away from said non-expansible member, .said non-ex ansible member having at least a portion tiereo of substantially uniform 105 diameter which is substantially the same as that of the proximate end of the expansible member, of a bolt passing through said nonexpansible member und adapted to expand said expansiblc member. 110

2. T he combination with an anchor having a non-expansible member and a separate expansible member adjustable toward and away from said l'ion-expansible member, said non-expansble member having at least 115 a portion tiercof of substantially uniform diameter which is substantially the. same ns that of the proximate end of the cxpausible member, of expanding means passing through said noncxpansible member and 120 adapted to expand said expuusible member.

W illnesses:

Manutan' Ana usos, ALAN M. Jonsson. 

